Mechanical pulsating forming board

ABSTRACT

A MECHANICAL PULSATING FORMING BOARD FOR A FOURDRINIER PAPER MACHINE WHICH IS USED TO PRODUCE TURBULENCE TO RETARD DRAINAGE AND FORM A LARGER AREA OF PAPER WITH REDUCED WATER CONSUMPTION AND BETTER QUALITY CONTROL. THE FLAT ELONGATED BOARD IS DISPOSED DIRECTLY BENEATH THE FORMING WIRE, TRANSVERSE TO THE WIRE MOVEMENT, AND INCLUDES APERTURES WHICH EXTEND THROUGH THE BOARD AND WHICH ARE INCLINED IN THE DIRECTION OF WIRE MOVEMENT. AN OSCILLATING PLATE SLIDABLY ENGAGES A LONITUDINAL RECESS IN THE BOTTOM OF THE BOARD. THIS PLATE IS PROVIDED WITH APERTURES WHICH MATCH AND ALIGN WITH THE INCLINED APERTURES IN THE BOARD. WITH RECIPROCAL MOVEMENT OF THE PLATE THE INCLINED APERTURES ARE ALTERNATELY OPENED AND CLOSED, THEREBY PULSATING THE STOCK ON THE FORMING WIRE.

United States Patent Ofice 3,598,694 Patented Aug. 10, 1971 3,598,694 MECHANICAL PULSATING FORMING BOARD Philip Wiebe, 22 Albert St., Saint Catharines, Ontario, Canada Filed Aug. 15, 1969, Ser. No. 850,419 Int. Cl. D21f 1/00 U.S. Cl. 162-351 3 Claims ABSTRACT OF THE DISCLOSURE A mechanical pulsating forming board for a Four drinier Paper machine which is used to produce turbulence to retard drainage and form a larger area of paper with reduced water consumption and better quality control. The flat elongated board is disposed directly beneath the forming wire, transverse to the wire movement, and includes apertures which extend through the board and which are inclined in the direction of wire movement. An oscillating plate slidably engages a longitudinal recess in the bottom of the board. This plate is provided with apertures which match and align with the inclined apertures in the board. With reciprocal movement of the plate the inclined apertures are alternately opened and closed, thereby pulsating the stock on the forming wire.

SUMMARY OF THE INVENTION My forming board is intended to be placed near the breast roll directly underneath the wire of a Fourdrinier paper machine. The aim is to have better control of paper formation, taking some guess work from the papermaker.

The board of this invention is of simple design and includes vehicle excess holes and a plate that oscillates to open and close the vehicle excess holes.

The vehicle excess holes are designed in a V pattern; when the stock is interfered with by pulsation, V waves are created in the flow of the stock, these waves interfering with each other to produce controlled turbulence. Control of the turbulence created results in retarding drainage. This enables the paper sheet to be formed with a greater area of the table while there still is sufficient vehicle remaining; less water is used in the forming of a sheet of paper.

The present day shake on the .faster paper machines benefits the forming process for only a short distance. With the forming board of this invention, regulation of the rate of opening and closing of the vehicle excess holes permits the fiber to be danced into a good quality.

BRIEF DESCRIPTION OF THE DRAWINGS In the drawings:

FIG. 1 is a detail top view;

FIG. 2 is an end view of my invention; FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof; and FIG. 5 is an additional detail view.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS Referring now to FIGS. 1-4, the board or belt to be used for forming has a plurality of spaced holes 12 which extend inclinedly downwards in the horizontal board. The holes define in the horizontal plane a plurality of VS disposed side by side. Each hole is disposed at the top surface of the board at the vertex of a shallow V-shaped slot 14.

The Fourdrinier wire belt passes adjacently over the top surface of the belt or board (from left to right in FIG. 2). An oscillating plate 18 slidably disposed in a slot 20 in the bottom surface of the board 10 is secured to a housing 22 and is reciprocated back and forth in a horizontal plane by any standard reciprocating mechanism (not shown).

The holes 12 in the board 10 are at an angle to the direction of movement of the wire 16. The oscillating plate 18 has the same pattern of holes as the board. On top of the board in front of the holes, are machined the tapered V slots 14, on the same principle as the present foil used to replace the table roll. This board is placed near the head box, where there is ample water. The plate that opens and closes the holes is reciprocated with any conventional variable speed control.

The purpose of the board is to create pulsation on the stock or the wire, thus producing turbulence by regulating the speed of opening and closing of the holes. This refines or shakes up the stock to such as extend as to have more control of the formation, and making the paper machine more versatile to the various grades of paper producedaiding shake of the wire and aiding the Dandy.

When the holes in the board are in the open position suction is created by the V tapered slots-and the water passes through the angle holes. When the holes are closed pulsation takes place.

While I have described my invention with particular reference to the drawings such is not to be considered as limiting its actual scope.

Having thus described this invention what is asserted as new is:

1. In a Fourdrinier paper making machine including a forming wire, the improvement comprising:

a fiat horizontal elongated member disposed transversely to the direction of wire movement and having a top surface and a bottom surface, a plurality of spaced holes extending between said surfaces and inclined from said top surface to said bottom surface in the direction of wire movement, the holes being arranged in a zig-zag pattern running longitudinally of the elongated member, said top surface being directly beneath the wire of said machine, the elongated member having means at said bottom surface for opening and closing said holes.

2. The invention claimed in claim 1, in which said top surface is provided with a plurality of V-shaped tapering slots, each of said holes opening into the vertex of one of the V-shaped tapering slots.

3. The invention claimed in claim 1, in which said elongated member has a central longitudinal recess in its bottom surface, said means for opening and closing said holes including an apertured plate disposed slidably in said recess and having apertures arranged in a pattern matching said zig-zag pattern, such that movement of the apertured plate longitudinally with respect to the elongated member opens and closes said holes.

References Cited UNITED STATES PATENTS 1,822,023 9/1931 Giebeler 162-2l1 2,487,202 11/1949 Wadleigh 162-374 2,699,709 1/ 1955 Breuning et al. 162209' S. LEON BASHORE, Primary Examiner T. G. SCAVONE, Assistant Examiner U.S. Cl. X.R. 

